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/* Modified ftw() -- uses lstat() instead of stat() */
/* Copyright (C) 1992, 1994, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ian Lance Taylor (ian@airs.com).
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include "config.h"
#if HAVE_ALLOCA_H
# include <alloca.h>
#endif
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef NAMLEN
#define NAMLEN(a) strlen((a)->d_name)
#endif
#ifndef PATH_MAX
#ifdef _POSIX_VERSION
#define PATH_MAX _POSIX_PATH_MAX
#else
#ifdef MAXPATHLEN
#define PATH_MAX MAXPATHLEN
#else
#define PATH_MAX 1024
#endif
#endif
#endif
#include "myftw.h"
/* Traverse one level of a directory tree. */
static int
myftw_dir (DIR **dirs, int level, int descriptors,
char *dir, size_t len,
int (*func) (const char *file,
struct stat *status,
int flag))
{
int got;
struct dirent *entry;
int d_namlen;
got = 0;
errno = 0;
while ((entry = readdir (dirs[level])) != NULL)
{
struct stat s;
int flag, retval, newlev = 0;
++got;
if (entry->d_name[0] == '.'
&& (entry->d_name [1] == '\0' ||
(entry->d_name [2] == '\0' && entry->d_name[1] == '.')))
{
errno = 0;
continue;
}
d_namlen = NAMLEN(entry) + 1;
if (d_namlen + len > PATH_MAX)
{
#ifdef ENAMETOOLONG
errno = ENAMETOOLONG;
#else
errno = ENOMEM;
#endif
return -1;
}
dir[len] = '/';
memcpy ((void *) (dir + len + 1), (void *) entry->d_name, d_namlen);
if (lstat (dir, &s) < 0)
{
/* Following POSIX.1 2.4 ENOENT is returned if the file cannot
* be stat'ed. This can happen for a file returned by readdir
* if it's an unresolved symbolic link. This should be regarded
* as an forgivable error. -- Uli. */
if (errno != EACCES && errno != ENOENT)
return -1;
flag = MYFTW_NS;
}
else if (S_ISDIR (s.st_mode))
{
newlev = (level + 1) % descriptors;
if (dirs[newlev] != NULL)
closedir (dirs[newlev]);
dirs[newlev] = opendir (dir);
if (dirs[newlev] != NULL)
flag = MYFTW_D;
else
{
if (errno != EACCES)
return -1;
flag = MYFTW_DNR;
}
}
else
flag = MYFTW_F;
retval = (*func) (dir, &s, flag);
if (flag == MYFTW_D)
{
if (retval == 0)
retval = myftw_dir (dirs, newlev, descriptors, dir,
d_namlen + len, func);
if (dirs[newlev] != NULL)
{
int save;
save = errno;
closedir (dirs[newlev]);
errno = save;
dirs[newlev] = NULL;
}
}
if (retval != 0)
return retval;
if (dirs[level] == NULL)
{
int skip;
dir[len] = '\0';
dirs[level] = opendir (dir);
if (dirs[level] == NULL)
return -1;
skip = got;
while (skip-- != 0)
{
errno = 0;
if (readdir (dirs[level]) == NULL)
return errno == 0 ? 0 : -1;
}
}
errno = 0;
}
return errno == 0 ? 0 : -1;
}
/* Call a function on every element in a directory tree. */
int myftw (const char *dir,
int (*func) (const char *file,
struct stat *status,
int flag),
int descriptors)
{
DIR **dirs;
size_t len;
char buf[PATH_MAX + 1];
struct stat s;
int flag, retval;
int i;
if (descriptors <= 0)
descriptors = 1;
dirs = (DIR **) alloca (descriptors * sizeof (DIR *));
i = descriptors;
while (i-- > 0)
dirs[i] = NULL;
if (lstat (dir, &s) < 0)
{
/* Following POSIX.1 2.4 ENOENT is returned if the file cannot
* be stat'ed. This can happen for a file returned by readdir
* if it's an unresolved symbolic link. This should be regarded
* as an forgivable error. -- Uli. */
if (errno != EACCES && errno != ENOENT)
return -1;
flag = MYFTW_NS;
}
else if (S_ISDIR (s.st_mode))
{
dirs[0] = opendir (dir);
if (dirs[0] != NULL)
flag = MYFTW_D;
else
{
if (errno != EACCES)
return -1;
flag = MYFTW_DNR;
}
}
else
flag = MYFTW_F;
len = strlen (dir);
memcpy ((void *) buf, (void *) dir, len + 1);
retval = (*func) (buf, &s, flag);
if (flag == MYFTW_D)
{
if (retval == 0)
retval = myftw_dir (dirs, 0, descriptors, buf, len, func);
if (dirs[0] != NULL)
{
int save;
save = errno;
closedir (dirs[0]);
errno = save;
}
}
return retval;
}
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